2. LITERATURE SURVEY
[1] Albert F Rockwell (1910) 1
PNEUMATIC SPRING:
1. A vehicle spring comprising a plurality of independently mounted cylinders and' valves for maintaining a uniform pressure in the cylinders and the source of fluid pressure supply, substantially as described.
2. A vehicle spring comprising a plurality of independent mounted cylinders and pistons arranged for reverse operation one of said cylinders and pistons operating in one direction being of greater power than the combined cylinders and pistons operating in the opposite direction, substantially as described.
3. A vehicle spring comprising a central vertically disposed cylinder, piston, and piston rod, and two cylinders, pistons, and piston rods one upon each side of the central cylinder, piston and piston rod and inclined with relation thereto, substantially as described.
4. A vehicle spring comprising a central vertically disposed cylinder, piston and piston rod, "and two cylinders, pistons and piston rods one upon each side of the central cylinder, piston and piston rod, the piston rods of the pistons of the side cylinders being connected to a support in line with; each other upon one side of a plane cutting the axis of the central cylinder, piston an piston-rod and the side cylinders being connected to a support in line with each other upon the opposite side of said plane, substantially as described. 5. Vehicle spring comprising a plurality of reversely arranged cylinders, pistons and piston rods and joints connecting the cylinders and piston rods to their sup ports, one of said piston rods and joints having a communicative passage with the interior of one of the cylinders} through which fluid pressure may be introduced into said cylinder.
6. A vehicle spring comprising a weight lifting and porting element, a plurality of independently mounted and oppositely operating resisting elements, the combined power 0 the latter elements being less than the former element, means for operating said elements by fluid pressure and means 10 for maintaining a uniform pressure in said elements and in the source of fluid pressure supply, substantially as described.
[2] Randall G Falk (2003) 2
MOTOR CYCLE FRONT WHEEL SUSPENSION SYSTEM WITH PNEUMATIC SPRINGS:
A motorcycle front wheel suspension includes a pair of suspension struts mounted in parallel with a pair of fork struts. Each fork strut and suspension strut pair are connected at a bottom end by a link. The two fork struts are connected together by a pair of crossbeams.
The top ends of the suspension struts are connected by arms to a crosshead. The crosshead is mounted to the top crossbeam through a pair of pneumatic springs. An axle is mounted to the lower ends of the suspension struts. A pressure air sources is installed on the motorcycle to provide pressure air to the pneumatic springs.